The family tree on the Fisher Web Site contains information about Phillippus Andries MINNAAR. My research tentatively points to him as my husband's great-great-grandfather. Your tree has more specific information about him than I've seen elsewhere. For instance, Voortrekkerstamouers 1835-1845 by J. C. Visagie, lists his ancestry as "ongeklassifiseer." I would like to find out the source of your information in the hopes that it will lead back to another generation.
You can view posts re my search for the MINNAAR family at my blog:
MyHeritage has proven frustrating in that I can't find how to ask for an invitation to become a member of your tree or where I can send you a private e-mail so that we might exchange more detailed information and e-mail addresses.